B. J. Harrison Reads the Man That Corrupted Hadleyburg

Hadleyburg is a decent American town where all the people are honest, selfless and honorable. At least, that is how they see themselves. One day a stranger arrives in town and somehow the locals manage to offend him so badly that he is determined to get his revenge on them by exposing their true nature, which according to him is far from "incorruptible".
How will he tempt the people that are so well trained to avoid temptation? Are they really as honest as they claim to be?